Informatics Publishing Limited

Praful R. Dongre ¹, Ramesh Babu R. ², Ananthbabu M. D. ³, Revanna D. ⁴

Affiliations
1 Vibration Laboratory(MED), Central Power Research Institute, Bangalore-560080, IN
2 AD, EVRC, Central Power Research Institute, Bangalore-560080, IN
3 JD, Vibration Laboratory (MED), Central Power Research Institute, Bangalore-560080, IN
4 JD, MED, Central Power Research Institute, Bangalore-560080, IN

Abstract

Fatigue is a common cause for failure of conductors near associated hardwares and attachment. Vibrations due to wind is a common cause for fatigue and frettingof conductors. Conductors under the effect of high frequency and low amplitude are more prone to vibrations particularly in India and other parts of the world. ACSR conductors have been a popular choice for overhead conductors due to advantages in both electrical and mechanical characteristics and these conductors are more prone to Aeolian vibrations. Vibration dampers are widely used to control Aeolian vibration of the conductors and earthwires including optical ground wires. In this paper the author presents the performance of vibration dampers on ACSR conductors. The author emphasizes the importance offor evaluating the suitability of a damper for a particular overhead line by choosing appropriate design tension, type, quantity and placement of vibration dampers to avoid failure of lines.

Keywords

Aeolian vibration, Fatigue,Vibration dampers, conductors, earthwires, OPGW Power dissipation etc

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Srujana N. ¹, Ramesh Babu R. ², Katta Venkataramana ³

Affiliations
1 Ph.D Student, Dept. of Civil Engineering, NITK, Mangalore - 575025, Karnatakam, IN
2 Additional Director, Earthquake Engineering & Vibration Research Centre, CPRI, Bangalore - 560080, IN
3 Professor, Dept. of Civil Engineering, NITK, Mangalore - 575025, Karnatakam, IN

Abstract

History of past earthquakes had demonstrated that structural failures in substations were nonrecoverable unless huge amount of money and man power involves in it. A broad range of substation equipment are especially vulnerable to seismic vibrations and circuit breaker is one among them. Failure in circuit breaker results flow of excessive current in substation components than the respective ratings. Excessive current in substation components cause fire accidents along with power outages. The efficient way to resolve the problem is to analyze and identify the failure points over the earthquake vibrations before installing in the field. This paper discusses in relation to earthquake acceleration amplification of 12 kV circuit breaker used in substations. Shake table experiments are conducted on circuit breaker at higher seismic zone levels. The ground motion amplification obtained from finite element analysis and shake table tests is compared.

Keywords

Circuit breaker, Ground motion amplification factor and Shake table experiments

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